Hadith 2:517

Narrated Hakim bin Hizam:

I said to Allah's Apostle, "Before embracing Islam I used to do good
deeds like giving in charity, slave-manumitting, and the keeping of
good relations with Kith and kin. Shall I be rewarded for those
deeds?" The Prophet replied, "You became Muslim with all those good
deeds (Without losing their reward)."